吉木萨尔凹陷二叠系芦草沟组咸化湖混合沉积模式

发布时间：2018-05-11 01:24

本文选题：吉木萨尔凹陷 + 芦草沟组　；参考：《石油学报》2017年06期

【摘要】：准噶尔盆地吉木萨尔凹陷二叠系芦草沟组是中国陆相非常规油气勘探的重要目标,通常认为芦草沟组沉积环境为咸化湖。在野外露头、井下岩心、岩石薄片、X射线衍射矿物分析及扫描电镜等观测资料的基础上,通过复杂岩相及沉积环境分析,认为吉木萨尔凹陷二叠系芦草沟组广泛发育典型的咸化湖相混合沉积,既包括混积岩,又包括混积层系。研究结果表明,芦草沟组致密油储层岩石矿物成分混杂,混积特征明显,宏观上表现为陆源碎屑岩、碳酸盐岩及火山碎屑岩所构成的交互沉积层系,微观上则表现为陆源碎屑组分、火山碎屑组分与碳酸盐组分所构成的混积岩。基于沉积环境与物源变化提出了3种混合沉积类型,分别是相缘混合沉积、母源混合沉积和突变式原地混合,同时建立了芦草沟组咸化湖背景的"多源同期、混合沉积"模式,并探讨了陆相咸化湖混合沉积对于致密油勘探的意义。
[Abstract]:The Lucaogou formation of Permian in Jimusar depression of Junggar Basin is an important target of unconventional oil and gas exploration in continental facies of China. It is generally considered that the sedimentary environment of the Lucaogou formation is a saline lake. Based on the observation data of outcrop, downhole core, thin slice of rock, X-ray diffraction mineral analysis and scanning electron microscope, the complex lithofacies and sedimentary environment are analyzed. It is considered that typical mixed deposits of saline lacustrine facies are widely developed in the Permian Lucaogou formation in Jimusar Sag, including both migmatite and mixed strata. The results show that the rock mineral composition of the tight oil reservoir of Luchaogou formation is mixed, and the mixing characteristics are obvious. In macroscopic view, the rocks are composed of continental clastic rocks, carbonate rocks and volcanic clastic rocks. Microscopically, they are mixed rocks composed of continental clastic components, volcanic clastic components and carbonate components. Based on the variation of sedimentary environment and provenance, three kinds of mixed sedimentary types are proposed, which are facies margin mixed deposition, parent mixed deposition and abrupt in-situ mixing. At the same time, the "multi-source synchronic, mixed deposition" model of the Lucaogou formation salt lake background is established. The significance of continental saline lake mixed deposits for tight oil exploration is also discussed.
【作者单位】：中国石油大学地球科学学院;中国石油集团科学技术研究院;
【基金】：国家重点基础研究发展计划(973)项目(2015CB250901)资助
【分类号】：P618.13

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